A pressure test on the Beer BarrelAs the 17th century, when there is no toothpaste tubes, therefore, cast doubt on Blaise Pascal ,1623-1662, the famous French scientist and philosopher whether the proposed Pascal principle, if every morning were wrestling with its function. However, it is certain that many of the hydrostatic stress-related and other effects are escape his attention, first of all is the principle of hydraulic cranes. How about the Pascal PrincipleLong ago, our engineers made use of this type of machine, today, as long as in the parking lot or gas station, you can see the hydraulic crane, use it to exert a child's effort to be able to lift a car. Let us look at how these devices work, and try to produce their own equipment for an experimental use. At home, making a type of small hydraulic deviceWith this small machine can be done, "Hercules" (the son of Zeus, Lidawuqiong, heroes who have completed 12 performance) as the cause. Ready for a closed fluid-filled barrel (do not leave the air, because the air under pressure will be compressed), you can begin to demonstrate to your friends. The casks will be filled with the liquid also with a small syringe filled with liquid and small tubes connected together, you will see the latter two are able to instantly shattered barrel. We try to balance an account: a cross-section of 0.5 square centimeters of ordinary syringes, using thumb pressure exerted on the piston is 20 kg (with the scales to test, to achieve this weight is not difficult), the outcome of the pressure actually is 40 atm! few casks to withstand such pressure. Unfortunately, a farmer discovered this phenomenon. He wanted to by a long thin tube that precious wine from their own country farmhouse transported to the low 30 meter hill at the foot of a friend's house. Everything is going well: a friend's house in barrels filled with wine, but then the pressure of the liquid inside the tubes so quickly broken cask of wine soaked the house.Aerial work platformhttp://en.wikipedia.org/wiki/Aerial_work_platformHydraulic Jacks, Bottle Jacks:http://www.chinahydraulicjacks.com/c...raulicjack.htmHow a hydraulic lift operates:http://wiki.answers.com/Q/How_a_hydraulic_lift_operatesGroups Discussing hydraulic lift| Yahoo! Groups: http://groups.yahoo.com/phrase/hydraulic-lift